OK I know nothing about this except I was given it about 8 years ago by a guy I knew, he said his grandfather got it off a Russian submariner at the end of WW2,
I had/have my doubts as it never looks to have been issued? and it has no markings in it save a 2 near the collar.
It is a very dark brown and very heavy though also very warm, I wore it one new years at a 1970's fancy dress night and it was great thing to be wearing at least on the pub to pub walks!
If anything it looks more German to me?